Lagering beers in your home can now be an easy and simple process with this Johnson Control Refrigerator Thermostat! This unit easily installs on your refrigerator or freezer to help maintain your desired fermentation temperature. Installation is as easy as connecting your appliance to the thermostat and then plugging the thermostat into a standard 120V outlet. Designed with an analog dial this unit allows you to set your temperature between 30°F - 80°F using 1° increments. This thermostat has a 3.5 degree differential so the unit will shut your fridge/freezer off at 3.5 degrees below your set temperature and restart the unit once the temperature exceeds your desired set point. The minor fluctuation in temperature of your fermenting brew will not cause any ill effects.